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Abstract

Fatigue crack growth under cyclic tensile stress was measured in thin (<1mm) specimens of type 316 austenitic stainless steel by means of direct optical observation. The effect of varying the maximum applied stress and the load ratio was investigated, and crack growth rate data were correlated with the stress intensity factor range. Fracture surfaces were studied using optical and scanning electron microscopy in order to ascertain the fracture plane orientation and the crack growth mechanisms. The intent of the work was to establish whether fatigue tests on reduced size, thin section specimens, where these are required by experimental exigencies, could provide meaningful crack growth data. The validity of the linear elastic fracture mechanics approach to fatigue crack growth in such specimens is demonstrated. Some reservations remain however as to the applicability of thin specimen data to crack growth in bulk material because the transition from normal to slant fracture plane orientation, with consequent reduction in crack growth rate, takes place at an earlier stage in thinner section material.

Additional information

Authors: RICKERBY D C, JRC ISPRA ESTAB.;FENICI P JRC ISPRA ESTAB., JRC ISPRA ESTAB.
Bibliographic Reference: ENGINEERING FRACTURE MECHANICS, VOL. 19 (1984), NO. 4, PP. 585-599
Record Number: 1989122045100 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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